Three arm mobile



FIG. 1 is a top front perspective view of a three arm mobile showing my new design, the toys shown in broken lines for illustrative purposes only and form no part of the claim;

FIG. 2 is an inverted bottom perspective view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a side elevational view thereof. 

The ornamental design for a three arm mobile, as shown and described. 